open access

https://hdl.handle.net/2115/28049

Stardusts in Meteorites : Precursors of Planets

英語

isotopes

2006-07-12

American Institute of Physics

AIP Conference Proceedings

847

319-323

ORIGIN OF MATTER AND EVOLUTION OF GALAXIES: International Symposium on Origin of Matter and Evolution of Galaxies 2005: New Horizon of Nuclear Astrophysics and Cosmology

Presolar circumstellar grains have been surveyed in 18 primitive meteorites. More than hundreds presolar grains have been identified. Presolar silicates are the most abundant species among presolar grains. The typical size is ~300 nm and the abundance is ~50 ppm in the most primitive chondrites. Main source of silicate presolar grains is from AGB and red giant stars. The average O-isotopic composition of presolar silicates is enriched in 17O relative to the solar composition. The counterpart to form solar isotope ratios having 17O-depleted compositions are missing in the chondrites. The missing matter would be supernovae ejecta but it is difficult to identify because the grain size is expected to be ~10 nm. ©2006 American Institute of Physics

学術雑誌論文

Accepted Manuscript

Copyright 2006 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in "AIP Conference Proceedings 847, 319 (2006)" and may be found at https://dx.doi.org/10.1063/1.2234419.

0094-243X

1551-7616